Padlock



May 27', 1924. 1,495,173

M. HACKLNDER PADLOCK Filed Sent. 26, 1922 Patented May 27, 1,924.

nutren s'rarss weer PATENT PADLOCK.

Application filed September 26, 1922. Serial No. 590,582.

To all whom t may concern:

Be it known that I, MAX HACKLNDER, citizen of the Republic of Germany, residing at Neviges, Rhineland. Germany, have invented new and useful Improvements in Padlocks, of which the following is a speciiication.

This invention relates to p-adlocks whose casing is enclosed in protective shells or l0 armor of hard metal. Hitherto the armor of padlocks has been made of pieces of pressed or cast metal which were fastened to the enclosed casing of the padlock by rivets, screws or any other preferred fastening means and this involved considerable expenditure for labor without excluding the possibility of undoing the fastening means or forcing ofi' the armor by means of eX- plosives and thus depriving the lock of its protective coating.

The object of this invention is to provide locks with seamless armor, i. e., with a protective shell consisting of only one piece and enclosing the entire mechanism of the 2.5 padlock. The armor has only one opening for the key of the lock and two other openings for the staple or bow of the saine.

Locks with seamless armor of this kind are produced by first fitting the mechanism of the lock into a. rough, thin, sheet metal casing and then inserting this casing in 'a chill-mold so that the casing forms a core in the mold. Auxiliary cores are introduced through the walls of the chill-mold and penetrate into the thin metal casing. These auxiliary cores suspend the lock in the proper position in the interior of the chillmold and when the cast metal, which forms the armor, is poured in, it completely covers the sheet metal casing, except at points where the auxiliary cores are situated, holes being thus formed in the armor by the auxiliary cores, the one hole forming the key-hole and the two other holes serving to receive the ends of the staple or bow of the padlock. After the shell` as of aluminium, has been cast round the lock and after the molten metal has hardened the auxiliary cores which are attached to levers, are pulled out and after the top, part of the chill-mold is lifted the encased lock will be exposed to view.

Apart from the greatest security obf countersunk holes, which is necessary to afford security in ordinary locks, because they are completely covered in by the metal afterwards cast round the casing and have nothing to do with the external appearance of the lock. The shrinking of the cast metal covering results in the entire mechanism of the lock being firmly held so that all loosening of the rivets and screw, which would be liable to take place when the lock is constantly subjected to vibrations, is en-v tirely precluded.

The invention is shown in the drawing y in .which- Fig.l l is a cross section of the chill-mold and an enclosed lock on the line A-B of Fig. 2 and Fig. 2 is a plan view of the mold.

The chill-mold, in which the coating or armor is cast round thefpadlock, consists of a bottom plate 5 andv an upper plate 2 with a .mouth 7 into which the cast metal is poured. The top half 2 of the mold'is provided with handles 3. Levers 4 are provided for pulling out the auxiliary cores 6 and 8, the ends of the cores 6 penetrating into the primary or internal casing l of the padlock`A and the inner end of the core 8 penetrating into, the opposite side of this casing. The cores 6 and 8 hold the internal casing l of the lock with its mechanism suspended in the chill-mold -so that when liquid metal is poured in it will completely envelopthe casing l except where the auxiliary cores 6 and 8 form holes for thekey and the ends of the bow of the padlock.

l. Process for forming aseamless shell on a lock consisting in suspending the lock in a chill-mold by means of auxiliary cores and thereupon pouring metal into the mold.

2. Process for forming a seamless shell on padlocks consisting in suspending the name to this specification in thepresence of lock in a chill-mold by means of auxiliary tWo subscribing Witnesses.

cores ada ted to form holes in the shell for the bow aired key of the padlock, and pour- HACKLANDER' 5 ing metal into the mold in whichl the pad- Witnesses:

lock is suspended. PAUL F. KRANN In testimony whereof I have signed my M. MAmNGoWsKI. 

